18. Variable Valve Timing (VVT)
Honda’s VTEC system and Toyota’s VVT-i brought variable valve timing into the spotlight, optimizing engine efficiency and performance by adjusting valve operation according to driving conditions. This technology allows engines to deliver both better power and improved fuel economy, making it a staple in modern internal combustion engines. VVT continues to help automakers meet efficiency and emissions goals without compromising driving enjoyment. See source